使用pickBy过滤对象中的对象

Question

我正在尝试使用"lodash": "^4.17.10"来过滤对象。

见下面我的最低可行的例子：

​

const obj = {
    "2": {
        "title": "GeForce GTX 1070 SC GAMING ACX 3.0 Black Edition",
        "category": [{
            "term_id": 34,
            "name": "Graphic Card",
            "slug": "graphic-card",
            "term_group": 0,
        }],
        "currency": "$",
        "price": "547.85",
        "watt": "0",
    },
    "3": {
        "title": "GeForce White Edition",
        "category": [{
            "term_id": 32,
            "name": "other-card",
            "slug": "other-card",
            "term_group": 0,
        }],
        "currency": "$",
        "price": "600.85",
        "watt": "0",
    }
}

let allGpuParts = _.pickBy(obj, (value, key) => {
    return _.startsWith(key.category, "graphic-card")
})

console.log("allGpuParts")
console.log(allGpuParts)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

​

正如您目前可以看到的，没有返回任何结果。我只想要回对象"2":，它有弹格"slug": "graphic-card"。

有什么建议吗?如何与房客过滤？

谢谢你的回复！

Answer 1

您只需使用_.filter和_.isMatch来查找要查找的键值对，_.some就意味着是否有匹配的return true。

​

const obj = {
    "2": {
        "title": "GeForce GTX 1070 SC GAMING ACX 3.0 Black Edition",
        "category": [{
            "term_id": 34,
            "name": "Graphic Card",
            "slug": "graphic-card",
            "term_group": 0,
        }],
        "currency": "$",
        "price": "547.85",
        "watt": "0",
    },
    "3": {
        "title": "GeForce White Edition",
        "category": [{
            "term_id": 32,
            "name": "other-card",
            "slug": "other-card",
            "term_group": 0,
        }],
        "currency": "$",
        "price": "600.85",
        "watt": "0",
    }
}

const isGPU = o => _.isMatch(o, {slug: "graphic-card"});
const allGpuParts = _.filter(obj, ({category}) => category.some(isGPU));

console.log("allGpuParts")
console.log(allGpuParts)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

​

如果我误解了，或者有什么问题，请告诉我。

Answer 2

• 类别是一个对象数组，所以您需要以某种方式迭代它，例如使用https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some来查找是否有符合条件的项
• 您需要检查代码片段本身，而不是测试字符串-vs-对象类别。

我保留了一个startsWith测试，尽管您当前的示例也可以与一个完全匹配的

const graphicCategory = cat => cat.slug.startsWith('graphic-card'); // true or false test

_.pickBy(
    obj, // your object
    value => value.category.some(graphicCategory) // pick if some category has graphic-card
); // {2: { ... }}